You notice an accident in the tunnel. What do you have to do?

You answered correctly. In the event of an accident inside a tunnel, it is important to switch on your hazard warning lights to alert other drivers and help prevent further accidents. You should also inform emergency services using the SOS telephone, which is connected directly to rescue personnel and ensures they know your exact location in the tunnel. Leaving your vehicle is not always the safest first action, as it can put you in danger; following instructions from emergency services is important. These steps help ensure safety and a quick response in tunnel emergencies.